i think what you mean are birthmarks. as the name implies, you are born with them usually, but they can still develop over the years. while freckles will vanish over time if you avoid the sun, birthmarks dont. they are less dependent on sunlight, too, i know because i developed a tiny birthmark in my teens on my bellend.
another one would be skin cancer, but i hope you’re not talking about that, eventhough many people confuse them and birthmarks. i would advise you to check out online if you have any suspicious birthmarks and if you do, go see a doc. skin cancer can be treated exremely well if noticed in an early stage.
sorry if this isnt the most scientifically proven and sourced answer, it’s just my life experience (and that of my parents who go get skin cancer treatment on a yearly basis and get them frozen off, lasered away or even cut out by the dozens if not hundreds.)
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